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Hylton: Now that I think about it, I think you meant taking a look behind the firewall rather than the tag itself.
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Yes. My point is that there are some things you can do without tearing a resto apart to ensure you are getting what you think you are getting.
With respect to a removed trim tag, you can make the engine side look un-touched, but it's pretty hard to make the caulking on the other side look 35 years old when the tag has been off the car.
There are also a few body stamp dates scattered throughout the car that can be verified provided the seller is willing to let you remove a few interior parts using a screwdriver and socket.